ItemSend event is not firing

Question

I have an Outlook 2007 Add-in (VSTO). Any mail sent with Outlook should be modified before that.

I use the Application.ItemSend event and it works fine

Answer 1

This is by design: messages created and sent by Simple MAPI or mailto url do not trigger OOM events. This is done on purpose - there were some problems in those scenarios, so events were completely disabled.